Usually when we report leaks about Best Buy it is because an employee or “a source familiar with the matter” spills the beans. This time it’s Best Buy, or at least one of its locations, that is doing the spilling. As a result, we now know the release dates for the Motorola Xoom and the HTC Thunderbolt.

The Best Buy in Grand Rapids South used their Facebook page to list upcoming launch dates for new phones and devices. In addition to known launch dates for the Verizon iPhone on February 10th, and the Samsung Presto “hotspot” on February 17th, previously unknown launch dates for the Motorola Xoom Tablet on February 24th and the HTC Thunderbolt on February 14th were listed. Giving some credence to the notion that these previously unknown launch dates weren’t ready for public consumption yet, the post has since been removed, but not before a few smart folks took a screenshot of the post.

A previous leak about the Motorola Xoom and the HTC Thunderbolt has also allowed us to get an idea of their possible retail cost based on a minimum advertised price (MAP) list that made it on to the Internet. According to that list, the Motorola Xoom will retail for $799.99 while the HTC Thunderbolt will retail for $249.99. Of course, the MAP prices are only for those vendors who want money to help with marketing the devices. If they don’t need the funds they can sell the devices for whatever price they want.